做一次动作，但只在 x 次后重复

Question

所以基本上，如果出现以下情况，我需要通知用户：

a) 传感器断开连接并且上次没有发送警报 $send_threshold

b) 如果警报在同一天发送且大于 $repeat_threshold.

变量的示例值

$send_threshold = 12 * 60; // 12 min

$repeat_threshold = 2 * 60 * 60 + 45 * 60; // 2 hr 45 min

我对如何实现它一无所知。传感器是无状态的，所以我无法检查传感器是否在线，只能检查传感器发布到 api.

的接收数据的时间戳。

/* FUNCTIONS */
function handleDisconnectAlerts($sensor,$dataset,$users,$settings)
{
    end($dataset);
    $last_timestamp = $dataset[key($dataset)]['timestamp'];
    $now = time();
    if($now > $last_timestamp && $now - $last_timestamp > $settings['disconnect_alarm'] * 60)
    {
        $send_threshold = $settings['disconnect_alarm'] * 60;
        $repeat_threshold = $settings['disconnect_alarm_repeat_hours'] * 60 * 60 + $settings['disconnect_alarm_repeat_minutes'] * 60;

        //not really sure what to do from here.

    }
}

Answer 1

好吧，我猜是我自己想出来的。初始检查涵盖 60 * $settings['disconnect_alarm'] 的初始间隔。从那里我只需要检查是否在 $repeat_threshold 时间内没有发送警报。很有魅力。

function handleDisconnectAlerts($sensor,$dataset,$users,$settings)
{
    end($dataset);
    $last_timestamp = $dataset[key($dataset)]['timestamp'];
    $now = time();
    if($now > $last_timestamp && $now - $last_timestamp > $settings['disconnect_alarm'] * 60)
    {
        $repeat_threshold = $settings['disconnect_alarm_repeat_hours'] * 60 * 60 + $settings['disconnect_alarm_repeat_minutes'] * 60;
        $n_sent = R::count('sensoralerts',' timestamp >=:time and field_name="disconnect" and sensor_id=:id ',
            [':time'=>$repeat_threshold,':id'=>$sensor['id']]
        );
        if($n_sent == 0){
            multiSendDisconnect($users,$sensor);
        }
    }
}

做一次动作，但只在 x 次后重复

Do action once but only repeat it after x time

php

repeat